Catalytic performance of Ni/MgO catalyst in methane dry reforming

Ni−La catalyst supported on SiO 2 (Ni−La/SiO 2 ) synthesized using in situ glycine−nitrate combustion was analyzed for catalyst dispersion at various catalyst-to-support ratios and support surface areas. Catalytic activity of the catalyst was assessed for methane cracking. The catalyst with higher support loading had a better catalyst dispersion. The use of a support with high surface area also improved catalyst dispersion. Ni−La/SiO 2 B synthesized using a support with high surface area have a higher catalyst dispersion than that of Ni−La/SiO 2 A with a support of low surface area. As a result, Ni−La/SiO 2 B had a better methane conversion (the maximum of ∼60%) than that of Ni−La/SiO 2 A (∼40%) and offered a higher H 2 yield. Moreover, Ni−La/SiO 2 B was found to be active for carbon formation. Nevertheless, the catalyst remained catalytically active for methane cracking without deactivation.

Section: Resultssupporting

confidence: 89%

In Situ Glycine–Nitrate Combustion Synthesis of Ni–La/SiO₂ Catalyst for Methane Cracking

Tajuddin

Ideris

Ismail

2018

“…MgO is an alkaline earth metal oxide that has high thermal stability and pronounced surface basicity and may, therefore, be used as an industrial catalyst support. , Furthermore, MgO is a unique carrier for Ni catalysts as Ni can diffuse in the magnesia lattice, creating NiO–MgO solid solution . However, MgO was reported to have a very low Brunauer–Emmett–Teller (BET) surface area, and the reduction pretreatment of Ni/MgO catalyst has to be performed at a very high temperature (>1173 K). − In addition, supports or modifiers with high availability of oxygen on the surface are recommended to be used, because oxygen vacancies enhance the adsorption and dissociation of CO 2 . Ceria is one of the materials that releases and stores oxygen because of the simultaneous reduction of Ce 4+ to Ce 3+ associated with the creation of oxygen vacancies .…”

Section: Introductionmentioning

confidence: 99%

Syngas Production via Methane Dry Reforming over Ceria–Magnesia Mixed Oxide-Supported Nickel Catalysts

Al–Swai

Osman

Alnarabiji

et al. 2018

Self Cite

Dry reforming of methane (DRM) is becoming an appealing research topic because of the urgent need to minimize global warming and the demand for alternative energy resources. However, DRM commercialization and industrial scale application are limited by the deactivation of the applied catalysts. In this work, Ni-based catalysts supported on CeO 2 −MgO mixed oxides (0−20% CeO 2 molar content) were prepared and employed in DRM. The support was synthesized via a coprecipitation method followed by impregnation of Ni metal. The catalysts prepared were characterized by X-ray diffraction, Brunauer−Emmett−Teller (BET) analysis, temperature-programmed reduction, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy (FESEM) techniques. The catalytic performance of the catalysts was evaluated in a fixed-bed continuous reactor with an equimolar (CH 4 /CO 2 ) ratio at 1073 K. The addition of CeO 2 , as a promoter to the support, altered the interaction between Ni and MgO and modulated the properties of the catalysts toward an excellent activity performance and multiwalled carbon nanotubes (MWCNTs) production. CeO 2 significantly enhanced the BET surface area, promoted Ni dispersion, and improved the reducibility of the catalyst. Among the obtained catalysts, Ni/15%CeO 2 −MgO achieved the maximum conversion of both CO 2 (95.2%) and CH 4 (93.7%) without significant deactivation during the reaction. The superior catalytic performance of the aforementioned catalyst is due to the presence of a high quantity of active Ni sites and the high Ce 3+ /Ce 4+ ratio that promoted the formation of oxygen vacancies. With the aid of temperature-programmed oxidation, FESEM, transmission electron microscopy, and Raman spectroscopy analysis, it was found that the amorphous carbon encapsulated the active sites of the catalysts, in the absence of Ce, which suppressed the syngas production significantly. The introduction of Ce not only decreased the deposited carbon but also changed the type of the later to MWCNTs, which had positive effects on the activity of the catalyst.

“…Figure A,B shows the crystallinities of nickel and mixed metal oxides of fresh and reduced catalysts, respectively. All fresh catalysts demonstrated the diffraction peaks at 2θ of 28.6, 33.3, 47.8, 56.4, 59.3, 69.4, 77.0, and 79.3°, corresponding to the existence of the CeO 2 phase, and the diffraction peaks at 2θ of 37.0, 43.1, and 62.8° were attributed to MgO and NiO . The diffraction peaks at 2θ of 31.8, 34.5, 36.3, 63.0, and 68.1° confirmed the existence of ZnO phase found in the Ni/CeZnAl and Ni/ z Ce y Mg x ZnAl catalysts.…”

Section: Resultsmentioning

confidence: 85%

Highly Efficient Conversion of Greenhouse Gases Using a Quadruple Mixed Oxide-Supported Nickel Catalyst in Reforming Process

Phichairatanaphong,

Yigit,

Rupprechter

et al. 2023

The greenhouse gas reduction as well as the utilization of more renewable and clean energy via a dry reforming reaction is of interest. The impact of a CeMgZnAl oxide quad-blend-supported Ni catalyst on performance and anticoking during dry reforming reactions at 700 °C was studied. A high Ce−Mg/Zn ratio, as seen in the CeMg0.5ZnAl-supported nickel catalyst, enhances lattice oxygen, and the presence of strong basic sites, along with the creation of the carbonate intermediate species, is accompanied by the production of gaseous CO through a gasification reaction between the carbon species and Ni-CO ads-lin site. The phenomena caused the outstanding performance of the Ni/CeMg0.5ZnAl catalyst�CH 4 (84%),CO 2 (83%) conversions, and the H 2 /CO (0.80) ratio; moreover, its activity was also stable throughout 30 h.